Resources/Dictionaries for late Medieval Tuscan-Italian?

by opsophagon

I'm currently working on several late Medieval Italian images of the so-called 'Sunday Christ' and I'm wondering if anyone might know of any resources for translating early dialects of the Italian language? Or, if anyone may be able to assist in translating a short inscription that appears in a manuscript from `1500:

Et però vi commando (et) vo' che sia / el dì della domenica guardato / et che sanctificate tutta via / et sia ogni exercitio abandonnato / né mai per priegi della madre mia / né mai per pregar dell'angelo beato / a chi non guarderà el dì benedecto / no(n) gli perdonnerò questo è l'effectto.

Any help would be greatly appreciated!

Buonicos

Italian native speaker and major in medieval history here.

Not a philologist, but here's my attempt:

I command and want you though to observe the day of Sunday, and to hallow continuously and to abandon every activity.

He who will fail to observe the holy day, here's the consequence: I shall not ever forgive him not even for (in the name of) my mother's virtues nor for the prayers of the holy angel.

As for the resources you may try on this website: http://www.ovi.cnr.it/Il-Vocabolario.html